What does the STDX size mean for these main bearings?

The STDX designation indicates that these main bearings are 0.001 inch undersize. This is important if your crankshaft has been machined to a smaller diameter to ensure proper clearance and oil film.

What is the material of these bearings made from?

These bearings are made from a lead-free, bi-metal aluminum composite material. This construction is chosen for its high-performance characteristics and durability in engine applications.

Are these bearings compatible with all 350 engines?

This set is designed for many General Motors 350 cubic inch V8 engines. However, it's crucial to verify fitment for your specific vehicle year and model, as well as confirm the correct bearing size needed for your crankshaft.

Specifications

Brand: King Engine Bearings
Part #: MB557HPSTDX
UPC: 611500530098

King Engine Bearings General Motors 262/267/302/307/327/350 (Size STDX) Main Bearing Set

Name: King Engine Bearings General Motors 262/267/302/307/327/350 (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-262-267-302-307-327-350-t14-770860
Price: 92.98 USD
Availability: BackOrder

$92.98

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King Engine Bearings main bearing set for GM 262-350ci V8 engines. Size STDX. Verified fitment.

Key Features

Fits a wide range of General Motors 262, 267, 302, 307, 327, and 350 cubic inch V8 engines.
Main bearing set with STDX sizing, meaning they are 0.001 inch undersize.
Constructed from a lead-free, bi-metal aluminum composite material for high performance.
Designed to meet the demanding requirements of engine rebuilding.
From King Engine Bearings, a specialist in engine bearing manufacturing since 1960.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the bottom end of a General Motors V8 engine, a solid set of main bearings is crucial for smooth operation and longevity. This main bearing set from King Engine Bearings is designed for a wide range of GM engines, including popular 262, 302, 307, 327, and 350 cubic inch displacements. These bearings are built with a lead-free, bi-metal aluminum composite material, offering a high-performance solution for your engine build.

King Engine Bearings specializes in creating high-quality engine bearings, and this set is no exception. The bi-metal aluminum construction is chosen for its performance characteristics, providing a durable and reliable surface for your crankshaft to spin against. The STDX size indicates these bearings are 0.001 inch undersize, which is important to note if you are machining your crankshaft to match.

This set is a popular choice for many GM applications, from classic muscle cars to trucks and SUVs. Ensure you have the correct main bearing size for your specific crankshaft dimensions when ordering.